Heat pipe



FIG. 1 is a top perspective view of a heat pipe showing my design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left view thereof;

FIG. 5 is a right view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof;

FIG. 8 is a bottom perspective view of the design of FIG. 1 positioned above the unassembled parts of a heat sink that is not claimed; and,

FIG. 9 is a bottom perspective view of the design of FIG. 1, in an environment of use connected to a heat sink that is not part of the claim.

The broken lines in FIGS. 8-9 represent environmental subject matter that is not included in the claim. 

CLAIM The ornamental design for a heat pipe, as shown and described. 